Core details	Core i7	Core i7 Extreme Edition
Development name	Bloomfield	Bloomfield
Construction size (nm)	45	45
Transistor count (millions)	731	731
Number of processor cores	4	4
Registers - ALU (bits)	64	64
Registers - FPU (bits)	80 (128 Ext)	80 (128 Ext)
Connection Type	LGA 1366	LGA 1366
Maximum TDP (watts)	130	130
Model Details
Name / Core speed (GHz)	920 / 2.66	965 / 3.20
	940 / 2.93	975 / 3.33
	950 / 3.03
QuickPath Interconnect Details
CLK speed (MHz)	133	133
Data transfer rate (MHz)	4800	6400
Total bus width (bits)	32	32
Maximum bandwidth (GB/sec)	19.2	25.6
Integrated Memory Controller Details
Controller width (bits)	3 x 64	3 x 64
Max DRAM CLK speed (MHz)	667	800
Controller type	DDR3	DDR3
Maximum bandwidth (GB/sec)	32.0	38.4
Cache details
L1 amount (KiB)	64	64
L1 location	on-die	on-die
L1 instruction cache size (KiB)	32	32
L1 data cache size (KiB)	32	32
L2 amount (KiB)	256 x 4	256 x 4
L2 location	on-die	on-die
L2 bus width (bits)	?	?
L3 amount (KiB)	8192 1	8192
L3 location	on-die	on-die
L3 bus width (bits)	?	?
Extension support
MMX	Yes	Yes
3DNow!	No	No
SSE	Yes	Yes
Enhanced 3DNow!	No	No
3DNow! Professional	No	No
SSE2	Yes	Yes
SSE3	Yes	Yes
SSSE3	Yes	Yes
SSE4	Yes (4.1, 4.2)	Yes (4.1, 4.2)
Additional Features
Intel 64	Yes	Yes
AMD64	No	No
HyperThreading	No	Yes
NX Bit	Yes	Yes
Virtualization Technology	Yes	Yes

Notes

1  -  L3 cache runs at 2.13 GHz

© AMD & Intel CPU Specifications - N D Evanson 2008